Threshold is a fantasy novel written by Sara Douglass in 1997.The story concerns a glassworker slave named Tirzah, forced into slavery because of her father's debts. She's tasked with helping building the eponymous Threshold, a pyramid made partially with huge glass panels. She meets a Magus named Boaz, hiding behind a Magi exterior a little too well. The Magi base a religion and magic power around the One, the number of all creation. And Threshold is being built to allow them to tap into the power of Creation and become immortal.Once Threshold is completed, though, it... doesn't go quite as planned.
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